Slack

Slack app install · Live

Find the message you half-remember.

Install the Lumen Slack app and the agent can search your workspace's messages with native Slack modifiers — `in:#channel`, `from:@user`, `after:YYYY-MM-DD`, `has:link`.

Add to SlackHow it worksLive
Auth
Slack app install (bot token)
Access
Read-only message search
Plan
Every plan
Freshness
Live — every search hits Slack's `search.messages` API
Available on
Every plan

Examples

Questions teams actually ask.

The tools it pulls from are shown inline — every answer in Lumen cites the underlying records it read.

Support

Find the thread where we decided how to handle duplicate refund webhooks — `in:#engineering has:link from:@rob after:2025-11-01`

pullssearchMessages
Onboarding

Who's had the "how does cost attribution work" conversation before, and what did we tell them?

pullssearchMessages
Product

What's every Slack mention of the word "churn" in #cs-escalations over the last 30 days?

pullssearchMessages
Leadership

Pull every message from @sam where they linked to a Notion doc in the last week.

pullssearchMessages

Preview

See what the answer looks like.

Toggle the tools Lumen is allowed to use. The plan, answer, and cited sources update to match.

Tools
Read-only
You

How did we decide to cap refunds last quarter?

Plan
  1. slack.searchMessages — `refund cap in:#finance in:#engineering after:2025-10-01 before:2025-12-31`
  2. sort by score; look at top 10 matches
  3. open the highest-score permalink for the thread where the decision landed
Answer

The decision came out of a finance ⇄ engineering thread on 12 Nov. Consensus was a $200 per-order, $2000 per-day, per-user cap, with human approval above that. Permalink: slack.com/archives/C.../p... · three follow-up messages added context.

Sources
  • [1]slack.searchMessages — 47 matches in #finance + #engineering
  • [2]slack.searchMessages — top 3 threads ranked by relevance

Scope

What Lumen sees. What it can change.

Read is on by default. Every write is a separate toggle, capped per user, and logged.

Read

What Lumen reads

Lumen calls Slack's `search.messages` endpoint with the bot's access. Results are scoped to whatever the bot user can see — typically public channels plus any private channel the bot has been invited to.

  • Message search

    Supports Slack's native modifiers: `in:`, `from:`, `has:link`, `has:file`, `after:`, `before:`

  • Result metadata

    Includes channel name, user, timestamp, and permalink for every match

Write · opt-in

What Lumen can write

Lumen does not post to Slack today. No message sending, no channel posts, no DMs. Posting Lumen answers back into a thread is on the roadmap as an opt-in per-channel action.

    Every search is logged with user, the query string (including modifiers), and the match count. Exportable as CSV.

    Install

    Connect in under a minute.

    No keys, no call, no app marketplace fine print.

    1. Install
      01

      Add to Slack

      In Settings → Integrations → Slack, click Add to Slack. You'll land on Slack's install page where you approve the bot scopes. Lumen stores the bot token encrypted and enforces one workspace per Lumen org.

    2. Invite to channels
      02

      Let the bot see what it should

      By default, bots can only see public channels. If you want the agent to search a private channel, `/invite @Lumen` in that channel. Revoking is as simple as `/kick` — the bot's search scope shrinks immediately.

    3. Ask
      03

      Try a search

      Start with "Find any mention of the word X in #channel this month." The agent will pick modifiers automatically and return the top matches with permalinks.

    Questions

    Frequently asked.

    Can Lumen post back into Slack?
    Not today. Message search is the only operation. Posting Lumen answers into threads (with per-channel opt-in and audit) is on the roadmap.
    What channels can Lumen see?
    Public channels in the workspace by default. Private channels and DMs require you to invite the bot. Lumen never sees anything the bot hasn't been explicitly added to.
    Does Lumen store my Slack messages?
    No. Every search runs live against Slack's API. Result snippets live inside the conversation that ran the search so the agent can cite them, and are deleted with the conversation.
    Can I connect multiple workspaces?
    One workspace per Lumen organisation today. If you have multiple workspaces, you'll want to create multiple Lumen orgs (or switch between them). Email us if multi-workspace is blocking you.
    What happens if the token is revoked?
    Searches fail with a clear re-auth error. Go back to Settings → Integrations → Slack and reinstall the app — same process as first install.
    Can I scope the bot to specific channels?
    Yes, via Slack's native channel invitation model. Lumen inherits whatever the bot can see. For stricter boundaries, create a dedicated Slack user for Lumen and invite it only to the channels you want.

    Pairs with

    Better together.

    Add Lumen to Slack. Find anything.

    Standard Slack app install. Read-only. One workspace per org.

    Add to SlackBack to all integrations